Simple example of creating a service backed widget in android
A virtual cat that lives on your home screen
vCat example application with source code see below that implements a simple widget and service.
If you ignore that cat widget, it becomes needy and meows.If you pet the cat, it purrs.
vCat is a home screen widget only and not a regular application, you will need to add it to your home screen for it to do anything.
You can find the source and tutorial here:
http:github.comjpudererTutorials